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1   /*
2    *    Copyright 2009-2023 the original author or authors.
3    *
4    *    Licensed under the Apache License, Version 2.0 (the "License");
5    *    you may not use this file except in compliance with the License.
6    *    You may obtain a copy of the License at
7    *
8    *       https://www.apache.org/licenses/LICENSE-2.0
9    *
10   *    Unless required by applicable law or agreed to in writing, software
11   *    distributed under the License is distributed on an "AS IS" BASIS,
12   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *    See the License for the specific language governing permissions and
14   *    limitations under the License.
15   */
16  package org.apache.ibatis.annotations;
17  
18  import java.lang.annotation.Documented;
19  import java.lang.annotation.ElementType;
20  import java.lang.annotation.Retention;
21  import java.lang.annotation.RetentionPolicy;
22  import java.lang.annotation.Target;
23  
24  /**
25   * The annotation that specify result map names to use.
26   * <p>
27   * <b>How to use:</b><br>
28   * Mapper interface:
29   *
30   * <pre>
31   * public interface UserMapper {
32   *   &#064;Select("SELECT id, name FROM users WHERE id = #{id}")
33   *   &#064;ResultMap("userMap")
34   *   User selectById(int id);
35   *
36   *   &#064;Select("SELECT u.id, u.name FROM users u INNER JOIN users_email ue ON u.id = ue.id WHERE ue.email = #{email}")
37   *   &#064;ResultMap("userMap")
38   *   User selectByEmail(String email);
39   * }
40   * </pre>
41   *
42   * Mapper XML:
43   *
44   * <pre>{@code
45   * <mapper namespace="com.example.mapper.UserMapper">
46   *   <resultMap id="userMap" type="com.example.model.User">
47   *     <id property="id" column="id" />
48   *     <result property="name" column="name" />
49   *     <association property="email" select="selectUserEmailById" column="id" fetchType="lazy"/>
50   *   </resultMap>
51   * </mapper>
52   * }
53   * </pre>
54   *
55   * @author Jeff Butler
56   */
57  @Documented
58  @Retention(RetentionPolicy.RUNTIME)
59  @Target(ElementType.METHOD)
60  public @interface ResultMap {
61    /**
62     * Returns result map names to use.
63     *
64     * @return result map names
65     */
66    String[] value();
67  }